I have the name of one Defendant who failed to comply with the Pre-Action Protocol.

However, I am yet to determine the name of further Defendants who have posted anonymously on the internet.

My question is, after naming the first defendant, can I use Persons Unknown for further Defendants until their names are revealed via disclosure at a later date or do they have to be named in Defamation law?

The reason I ask this is because I want to consolidate one claim instead of making numerous claims upon learning the names of the other Defendants.